Hi John,
The engines and gearboxes are the same, most Granadas/Scorpios have the seven and a half inch differential used in some sierras, as you say the rear hubs are five stud and have bigger bearings.
At the front it's the same story five stud hubs, bigger bearings but the geometry is different to the Sierra although it's not a big difference and the slightly larger strut fixing gives more scope for increasing the caster.
All in all it's pretty good donor, if you're willing to make changes to the book spec.
Cheers
Chris
